I'm using a DataGrid with edit functionalities in my project. It's handy, compared to having to edit its source data manually, but sadly, that means that I'll have to deal with validating user input a bit more.
And my problem is basically just that. When I set my DataGrid to EDIT mode, modify the values and then set it to UPDATE, what is the best way to check if a value that I've entered is, in fact, compatible with the corresponding column's data type?
i.e. (simple example)
// assuming
DataTable dt = new DataTable();
dt.Columns.Add("aa",typeof(System.Int32));
DataGrid dg = new DataGrid();
I have a DataTable that I am creating and binding to a GridView. Currently the headers do not have any spaces and it makes it hard to read. I want to space them out but I'm having a minor issue. What I am trying to accomplish :
Dim dc As Data.DataColumn dc = New Data.DataColumn("Updated Date", System.Type.GetType("System.String")) dt.Columns.Add(dc)
What I currently have :
Dim dc As Data.DataColumn dc = New Data.DataColumn("UpdatedDate", System.Type.GetType("System.String")) dt.Columns.Add(dc)
I know that I can set the HeaderText in the columns declaration like below, but I won't know how any columns I am going to have. And would rather the columns be generated automatically.
How do I go about adding a ButtonColumn to a DataTable.
I am basically using a DataTable as the DataSource of a DataGrid and need to add a ButtonColumn to the DataTable so that when I DataBind it to the DataGrid it all works.
Although when I try
dt.Columns.Add(buttonColumn)
This is not allowed. It has to be a basic DataColumn.
i am trying to create a datatable entering the columns that i create before, but i have a problem, the dataColumn doesn't have the required data, there is a AllowDbNull but it doesn't work.
Then i would like to add other restrctions like MinLegth.
I'm following along with Nerddinner making a few changes, and can't figure out why my Create form is not validating. I'm using Linq to SQL and trying to use Modelbinding to map my form data automatically. Using the code below, I do not receive any validation errors on the page, but can't make it past my try{} block. When unhandled, the error I receive tells me I'm unable to insert a Null value for "basetype". This is correct based on Database constraints, but why am I receiving exceptions, and not the nice red error messages and validation?
I have a textbox that the user is suppose to enter a valid user name , the valid user names are stored in database. for example the valid user names might be U100, U101, U102 ,U103,U104,U105,U106,U107. so if the user types anything other than that he should get a error message and I dont want to implement a drop down list for that , how to do this in asp or should i explore javascript for this.
I am using a MaskedEdit extender for a datetime entry. However, in case of invalid input of date and time, how am be able to validate it through the use of Ajax and validation will occur when the user clicks on the submit button.
I have two ddl'a which i insert into a database inform of a grid. Now i will like to make sure the two data i am inserting is not already on the databse and if it exist i want a message to show. I dont have anything right now. I just need ideas on how to go about it.
I've got a View where I allow input, the fields are set as float in my SQL Server 2008 R2 database and I am using Entity Framwork 4. In the Entity Framework Model the field looks like this private Nullable<global::System.Double> _TestNumber;
And the View uses an EditorField to allow input like this:
I am however getting this error in the Validation Message: The value '13.51' is not valid for TestNumber. I've tried with a comma instead of period, same thing.
I am where you "Create" an entry in the table, i have deleted the Id field, as Id is my primary key, and Is Identity = Yes, Identity Increment = 1, Identity Seed = 1.
When i hit the create button, the Id value is being validated, giving an invalid error. If i add the Id column back to the page, and fill in any number and click create, the entry is added to the database, with the Id value incremented (the typed in value does not matter). I believe this must have to do with the Movies.Designer.cs... but not sure how to fix it. Id should not be validated as it auto-incraments, but the model is looking for a Id value..
I developed a screen in which there are fields like first name,username,password and email. I validated these fields using javascript and came to know that javascript is not that safe. So i decided to validate on server side also. My question is whether i can use asp controls like requiredfieldvalidator, regularexpression validator to validate the form or i have to validate through server side coding??
When i use RequiredFieldValidator for Validation FCKEditor ,The first time that the form gonna submit, RequiredFieldValidator prompt (ErrorMessage) and indicate that FCKEditor is empty ,while it isn't .Again if you try to submit the form,It's OK and there is no problem .At this case user have to hit the submit button twice So i have to disable Client Side validation and validate form just in Server Side code which is not good.
I use an asp Login control with WebControlCaptcha as shown in the above code. The problem is that the captcha control always returns false when UserValidated method is called. I tried to use captcha control on another webpage without the login control it works.
I want to prompt the user to enter up to four specific months as an input on my page. Should I use a textbox control and just apply validators to it? or a check list box? which would control what the user puts it and would make it easier to iterate through the selected items? The only concerns I have are the looks of the list box. Can I make it look and feel like a drop down box? Also, how do I limit the selection to 4? If I use a text box, how do I validate that "up to" 4 items are entered let's say separated by a comma?
I have been thinking what is the right way to validate the data I am sending to a web method from jQuery ajax call. I have formerly used updatepanels to do my ajax, but am trying to shift to jQuery now and validation seems to get more complicated.
So obviously there are both client- and server-side validation options. At first I tried implementing jQuery validation plugin and got it working. But surely client-side validation is not good enough alone. Then I considered implementing regular asp.net validation to validate on the server. But what if a user tampers the input parameters after the validation happened. He could break the execution of the script in Firebug and change the input to whatever he wanted. So how can I either prevent that or implement validation in the web method?Here is my ajax call which sends a message to the server. [Code]....
You see I am sending three parameters (id of the person who this message is ment for, message type and message text). Even if I implement asp.net validation against input controls, a user might change those input values in Firebug, right? So I need to validate the input again in the web method? Or what would be the best way from the beginning?
Before committing the record from the postback of the Create or Edit method in my controller, I validate the values in the form against some business rules in the GetRuleViloations() of this domain object. The following rule example is written in two ways. The 1st one validates against the numeric values in form, the 2nd one validates using the associated object (lookup table in database) description via the foreign key. I would like to use the 2nd method, but during the Create postback the associated object is always null.
